This work was supported by the Asahi Glass Foundation (T.I.), MEXT KAKENHI (Grant-in-Aid for Scientific Research on Innovative Areas “Stimuli-responsive Chemical Species”) grant number 24109004 (T.I.), the Cooperative Research Program of “Network Joint Research Center for Materials and Devices” (T.I.), the Center for Integrated Nanotechnology Support at Tohoku University, and MEXT “Nanotechnology Network Project”. We thank Shinichiro Yoshida and Satomi Ahiko (Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University) for the solid-state NMR spectroscopy and elemental analysis. We also thank Prof. Hideo Nagashima (Institute for Materials Chemistry and Engineering, Kyushu University) for his warm encouragement after the Tohoku Earthquake.